J/A+A/678/A111ivo://CDS.VizieR/J/A+A/678/A111doi:10.26093/cds/vizier/bc-n6/lbbbCDSArdevol J.Monguio M.Figueras F.Romero-Gomez M.Carrasco J.M.2026-07-01T14:00:51Z2023-10-12T08:52:17ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmilky-way-galaxygalaxy-planesa-starsphotometryproper-motionsradial-velocityDespite their relatively high intrinsic brightness and the fact that they are more numerous than younger OB stars and kinematically colder than older red giants, A-type stars have rarely been used as Galactic tracers. They may, in fact, be used to fill the age gap between these two tracers, thereby allowing us to study the transition between them. We analyse Galactic disc structure and kinematic perturbations up to 6kpc from the Sun based on observations of A-type stars. This work presents a catalogue of A-type stars selected using the IGAPS photometric survey. It covers the Galactic disc within 30{deg}<l<215{deg} and |b|<5{deg} up to a magnitude of r<19mag with about 3.5 million sources. We used Gaia Data Release 3 parallaxes and proper motions, as well as the line-of-sight velocities, to analyse the large-scale features of the Galactic disc. We carried out a study of the completeness of the detected density distributions, along with a comparison between the b<0{deg} and b>0{deg} regions. Possible biases caused by interstellar extinction or by the usage of some kinematic approximations were examined as well. We find stellar overdensities associated with the Local and the Perseus spiral arms, as well as with the Cygnus region. A-type stars also provide kinematic indications of the Galactic warp towards the anticentre, which displays a median vertical motion of ~6-7km/s at a Galactocentric radius of R=14kpc. It starts at R=12kpc, which supports the scenario where the warp begins at larger radii for younger tracers when compared with other samples in the literature. We also detect a region with downward mean motion extending beyond 2kpc from the Sun towards 60{deg}<l<75{deg} that may be associated with a compression breathing mode. Furthermore, A-type stars reveal very clumpy inhomogeneities and asymmetries in the V_Z_-V_phi_ velocity space plane.2023A&A...678A.111Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/678/A111CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)V/165 : IGAPS. merged IPHAS & UVEX of northern Galactic plane (Monguio+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/678/A111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/678/A111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/678/A111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/678/A111https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/678/A111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/678/A111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/678/A111/astars (Northern Galactic disc A-type stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/678/A111/astars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/678/A111/astars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/678/A111/astars?GETtext/xml+votable180.050000true0.062666761.13452780.0055555555555555563/20 22 223 225 228-229 240 347 380 382 478 4/84 109 111-114 120 122 189-191 197-199 203-206 225-228 232 810-811 814 875 878-879 890-891 896-897 964-966 976-977 980 1382 1476-1477 1479 1485 1487 1490 1496 1498 1894-1895 1900-1901 1916 1918-1919 2005 5/344-346 368 370 407 413 415 443 460 462 484 486 735 751 755 785 787 805 807 828-830 832-834 840 842 897-899 916 920-922 932-934 936-938 3234-3235 3260 3262-3263 3306-3307 3310-3311 3322-3323 3326-3327 3498-3499 3511 3547 3549-3551 3554-3555 3557-3559 3592-3593 3596-3597 3681 3684-3685 3696 3868-3869 3912-3913 3916-3917 3924-3925 5517-5519 5532 5534 5540-5541 5543 5549 5551 5608 5610 5913 5915 5937 5952 5954-5955 5988 5990 5996 5998-5999 6036-6037 6039 6045 6047 6069 6104 6106 6128 6130 6136 6138-6139 7557 7559 7565-7567 7570-7571 7574 7588-7589 7591 7609 7612-7613 7624 7626-7627 7630-7631 7668 7670-7671 8004-8005 8016-8017 8019 6/1269 1271 1277 1279 1388 1390 1476 1478 1504-1506 1512 1514 1621 1623 1651 1657 1659 1741 1743 1765-1767 1844-1846 1852 1854 1856 1968 1970 1976 2911 2933-2935 2937-2939 2991 2997-2999 3001-3003 3013-3015 3017-3019 3127 3133-3135 3137 3139 3145-3147 3219 3225-3227 3239 3245-3247 3324 3326 3340-3342 3364 3366 3456-3458 3464 3466 3587 3668 3672-3674 3692 3694 3696 3740-3742 3756-3758 3760-3762 3776-3778 12930-12931 12952 12954-12955 12958-12959 13002 13046-13047 13218-13219 13222-13223 13234-13235 13287 13298-13299 13302-13303 13986-13987 13989-13991 14027 14030-14031 14042-14043 14175 14186-14187 14194-14195 14214-14215 14225-14227 14381 14392-14393 14396-14397 14399 14533 14544-14545 14548-14549 14720-14721 14788-14789 14800-14801 14804-14805 15480-15482 15484-15485 15488-15489 15492-15493 15656-15657 15660-15661 15704-15706 15708 15712-15713 15716 22055 22061 22063 22066-22067 22094-22095 22106-22107 22134 22140 22142-22143 22168-22169 22171 22193 22408 22410 22446 23573 23575 23581 23648-23649 23651 23657 23659 23756-23757 23759 23781 23783 23812 23814-23815 23856 23858 23864 23866-23867 23964 23966 23988 23990-23991 24153 24155 24177 24285 24287 24309 24311 24317 24319 24384 24386 24392 24394-24395 24430 24516 24518 24524 24526 24548 24550-24551 30233 30235 30257 30259 30272 30274-30275 30278 30302-30303 30360-30361 30432-30433 30457 30460-30461 30463 30500 30502-30503 30514-30515 30568 30570-30571 30574 30678-30679 32004-32005 32029 32072-32073 32113 32116-321171.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/678/A111?format=asciidefaultJ/A+A/678/A111/astarsNorthern Galactic disc A-type starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintrmagIGAPS r-band magnitudemagphot.mag;em.opt.Rfloate_rmagIGAPS r-band magnitude uncertaintymagstat.error;phot.magdoubleHamagIGAPS Ha-band magnitudemagphot.flux;em.line.Halphafloate_HamagIGAPS Ha-band magnitude uncertaintymagstat.error;phot.magdoubleimagIGAPS i-band magnitudemagphot.mag;em.opt.Ifloate_imagIGAPS i-band magnitude uncertaintymagstat.error;phot.magdoubleGaiaDR3? Gaia DR3 source identifiermeta.idnullableGmag? Gaia DR3 G-band apparent magnitudemagphot.mag;em.optdoublenullableBP-RP? Gaia DR3 G_BP_-G_RP_ colourmagphot.color;em.opt.B;em.opt.RdoublenullableRAdeg? Right ascension (ICRS) at Ep=2016.0 from Gaia DR3degpos.eq.ranullablee_RAdeg? Right ascension error from Gaia DR3masstat.error;pos.eq.rafloatnullableDEdeg? Declination (ICRS) at Ep=2016.0 from Gaia DR3degpos.eq.decnullablee_DEdeg? Declination error from Gaia DR3masstat.error;pos.eq.decfloatnullableplx? Gaia DR3 parallaxmaspos.parallax.trigdoublenullablee_plx? Error of Gaia DR3 parallaxmasstat.error;pos.parallaxfloatnullablepmRA? Proper motion in right ascension direction from Gaia DR3mas/yrpos.pm;pos.eq.radoublenullablee_pmRA? Error of proper motion in right ascension direction from Gaia DR3mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in declination direction from Gaia DR3mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error of proper motion in declination direction from Gaia DR3mas/yrstat.error;pos.pm;pos.eq.decfloatnullableRUWE? Gaia DR3 renormalised unit weight errorstat.weightfloatnullableRV? Gaia DR3 radial velocitykm/sphys.veloc;pos.heliocentricdoublenullablee_RV? Gaia DR3 radial velocity errorkm/sstat.errordoublenullableDist? Distance to the Sun computed according to an exponentially decreasing space density prior with a length scale of 3kpckpcpos.distance;pos.heliocentricfloatnullableXgal? Galactocentric X coordinatekpcpos.cartesian.x;pos.galactocentricdoublenullableYgal? Galactocentric Y coordinatekpcpos.cartesian.y;pos.galactocentricdoublenullableZgal? Galactocentric Z coordinatekpcpos.cartesian.z;pos.galactocentricfloatnullableR? Cylindrical Galactocentric radial coordinatekpcspect.dopplerVeloc;pos.galactocentricfloatnullablephi? Cylindrical Galactocentric azimuthal coordinatedegpos.frame;pos.galactocentricdoublenullablepmGLON? Proper motion in Galactic longitude directionmas/yrpos.pm;pos.galactic.londoublenullablepmGLAT? Proper motion in Galactic latitude directionmas/yrpos.pm;pos.galactic.latdoublenullablevbcorr? Velocity in Galactic latitude direction corrected for solar motionkm/sphys.veloc;pos.galactic.latdoublenullablevlcorr? Velocity in Galactic longitude direction corrected for solar motionkm/sphys.veloc;pos.galactic.londoublenullableVR? Cylindrical Galactocentric radial velocitykm/sspect.dopplerVeloc;pos.galactocentricdoublenullableVphi? Cylindrical Galactocentric azimuthal velocitykm/sphys.veloc;pos.galactocentricdoublenullableE(BP-RP)? G_BP-G_RP reddening derived from Green et al. (2019ApJ...887...93G) dustmapmagphot.color.excessfloatnullableVZ? Cylindrical Galactocentric vertical velocitykm/sphys.veloc;pos.galactocentricdoublenullableAG? G-band extinction derived from Green et al. (2019ApJ...887...93G) dustmapmagphys.absorptionfloatnullable_RAPositions from IGAPS name (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from IGAPS name (declination part)degpos.eq.dec;meta.mainindexedNameIGAPS source designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.mainchar